... The Radio Sky: Tuned to 408MHz . ... Tune your radio telescope to 408MHz (408 million cycles per second) and check out the Radio Sky! ... This mosaic of x-ray images cuts a swath across the photogenic Rosette Nebula, a stellar nursery 5,000 light-years from Earth in the constellation Monoceros, the Unicorn. ... As a result, these two Hubble Space Telescope storm watch images from late June and early September offer dramatically contrasting views of the martian surface. ...